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Someone sent you their contact information as a .vcf file — a vCard. Double-click it and your contacts app (Apple Contacts, Google Contacts, Outlook) offers to add the person. VCF is the universal format for sharing contact data: name, phone numbers, email addresses, physical addresses, job title, company, and even a photo.
The vCard format was originally developed by Versit (a consortium of Apple, AT&T, IBM, and Siemens) in 1995. VCF files are plain text — open one in a text editor and you can read the contact details directly (BEGIN:VCARD, FN:John Smith, TEL:+1-555-0100, etc.). A single .vcf file can contain multiple contacts, which is how address book backups and bulk exports work.
Every contacts application imports VCF — Apple Contacts, Google Contacts (via import), Microsoft Outlook, Thunderbird. On phones, tapping a .vcf attachment usually opens the contacts app with an "Add" prompt. For exporting your own contacts, most apps offer VCF export for backup or transfer. It's the one format that makes moving contacts between platforms genuinely painless.